Telegraph printer



Jan. 12, 1954 w. J. ZENNER 2,666,095

TELEGRAPH PRINTER Original Filed May 10, 1950 5 Sheets-Sheet l '1 Ill-1 HLIOZA h 28 n3 9 H 1 1 WE W712i; PSQ T ER TE TRANSMITTER PERFORATOR (LOCAL) (RECEIVING) INVENTOR j 2 J 13225? WALTER .1. ZENNER I FIG.2 F

ATTORNEY Jan. 12, 1954 Original Filed May 10 1950 W. J. ZENNER TELEGRAPH PRINTER I86 202 201 I69 I63 |4| N0. 1 FIG. 7 I] 93 A No.2 FIG. A l i LIB? NO. L --T- LETTERS 2 225 ADDRESS r NO. 2 z

M92 leoA' 234%77 5 Sheets-Sheet 2 FIG. 5B

FIG. 5

CODE BARS I36 FUNCTION BAR I38 PAwLs [6| STRIPPED BNL LATCHES we TRIPPED INVENTQR WALTER J. ZIENNER ATTORNEY Jan. 12, 1954 w. J. ZENNER TELEGRAPH PRINTER 5 Sheets-Sheet 3 Original Filed May 10, 1950 NO. I LETTERS NO. 2 LETTERS ADDRESS FIG. ll

INVENTOR WALTER J. ZENNER ATTORNEY Jan. 12, 1954 w ZENNER 2,666,095

TELEGRAPH PRINTER Original Filed May 10, 1950 5 Sheets-Sheet 4 LETTERS FIG. l4

INVENTOR WALTER J. ZENNER BYZ y ATTORNEY 1954 w. J. ZENNER TELEGRAPH PRINTER 5 Sheets-Sheet 5 Original Filed May 10, 1950 Q .QE 93 wmn mnm INVENTOR WALTER J. ZENNER 8? W ATTORNEY Nov now .9 may mm l wow m? T NOv mmm m vnm wmm v mmm Patented Jan. 12, 1954 TELEGRAPH iPRINTER Walter J. 'Zenner, Des Plaines, 111., assignor to Teletype Corporation, Chicago, 11]., a corporation of Delaware Original application May .10., 1950, Serial .No. 161,165. Divided and this application October 6, 1951, Serial No. .-2.50,056

Claims. 1

This invention pertains to printing ,telegrap'hy and more particularly to apparatus used in automatic telegraph switching systems.

This application is a division of copending application Serial No. 161,165, filed May 10, 1950, by W. J. Zenner.

The system in which the apparatus according to the present invention is employed, is designed to accommodate a relatively large number of telegraph transmitting and receiving stations. It is contemplated that each outlying station in the system is provided with a printing telegraph receiver, preferably of the type shown in United States Patent No. 2,505,729, granted April 25, 1950, toW. J. Zenner, on the receiving side of th line, and on the transmitting side of the line, a

local printing receiver of the same type just mentioned. All of the printers on the receiving side of the line at the outlying stations are equipped with a selective control unit of the type shown in the copendi-ng application of W. J. 'Zenner, Serial 'No. 739,747, filed April '7, 1947, now U. 8. Patent 2,563,264 dated September 18, 1951. For a more complete understanding of the telegraph equipment mentioned above, .reference should be had to the above mentioned patent and copending application, all of which are hereby incorporated by reference into the present disclosure.

In the present invention the incoming message from any of the outlying stations contains an address signal corresponding to the station in the system to which the message is to be delivered. This address signal actuates a series of code bars in each receiving printer on the line to which the message is addressed. Each of these receiving printers, as has already been stated, is equipped with 'a selective control unit, and these mechanisms function in a manner whereby the printing mechanisms of each of "the printers are locked out of operation. Immediately thereafter the address impulses actuate the selective control mechanism to condition for operation the printer at the station to which the message is addressed. Subsequent signals of the message continue to actuate the code bars in all of the stations on the receiving line, however, the printing mechanism operates only at the station which has been conditioned for operation by the address signal, and the printing mechanism at all the other stations remains locked out.

The principal object of the invention is to pro vide in a comprehensive telegraph switching system, apparatus whereby switching operations 2 are expedited by an economical and efficient switching system which functions automatically.

Automatic telegraph switching systems in use generally at the present time employ telephone switching methods which become highly complex and accordingly it is an important object of the present invention to materially simplify the electrical circuits utilized therein.

Another object of :the invention, therefore, is .to provide apparatus units designed to accomplish specific purposes thereby eliminating to a large degree the troubles caused by circuit complexity.

The foregoing and other objects, features and advantages of the invention will be more readily understood from the following detailed description when read in conjunction with the 'accompapying drawings wherein:

Fig. .1 is a schematic representation of the basic system utilizing the subject matter of the present invention;

Fig. 2 is a block diagram representing the telegraph "apparatus at an outlying station including the apparatus according to the present invention;

Fig. 3 is .a side elcvational view, partly in section, of the selective control unit according to the present invention;

Fig. 4 is a timing diagram for the selective control unit;

Fig. 5 is a fragmentary plan "view of the selective control unit located in the outlying station telegraph receivers according to the present invention;

Fig. 5B is a schematic representation of the mechanism in a station printer for suppressing printing during a switching operation;

Figs. 6 to 11 are side elevational views of the station selector function mechanism of the selective control unit;

Figs. 12 to 14 are side elevational views of the transmitter start function mechanism of the selective control unit; and

Fig. 15 is a diagram of the outlying station transmitter control circuit.

Referring now to Fig. 1 of the drawings, the basic telegraph switching system embodying the subject matter of the present invention is therein shown. Reference numeral l0! represents a central ofiice having a plurality of lines 102 through l'll associated therewith, all of which broadly forms the basic switching system of the invention. Each of the lines I02 through HI has a message delivery side H2 and a message pickup side 3.

ing telegraph receiver I 16 in circuit with the delivery side I I2 of the line. On the pickup side of the line each outlying station is equipped with telegraph sending apparatus Il'I consisting of a keyboard I iii, a page printer i I 9, a tape perforator IZI, and a tape transmitter I22. An operator at the outlying station types out the message by means of the keyboard I lgan'd the tape perforator IZI perforates this message in a tape. The

operator will undoubtedly desire to have a printed record of the message as it is being perforated, and for this purpose thepage printer i is may be used, Havingcompleted perforating the message in the tape, the operator places the leading end of the tape in the transmitter I22 to await trans- 'mission. When the messag in the tape is transmitted it is contemplated thata home record thereof will be made by the printer I IS.

The central office iill is equipped with a plurality of transmitter controllers I23, one of which is provided for each of the lines I02 through I i i of the system. Also, associated with each line is a multiple reperforator transmitter I24. The multiple reperforator transmitter I24 is provided with a plurality of individual reperforators I 26, each of which has a transmitter I2! associated therewith for, transmitting the messages perforated in the tape bythe corresponding reperforator.

The transmitter controller I23, one of which is provided for each line of the system, controls all transmission to or from its associated line. The transmitter controller I22 is designed to sequentially call each outlying station on the line with which it is associated, and in response to this call the station responds by transmitting "its message if it has one awaiting transmission, and if there is no message awaiting transmission the station responds by sending a blank signal or other predetermined signal. When such a signal, indicating the absence of an awaiting message, is transmitted the transmitter controller I23 calls the next station in sequence.

When the outlying station transmitter II'I responds by sending an awaiting message, the first few signals of such message contain a set of address signals. One of these signals indicates the line and another indicates the station on that line to which the message is addressed. The signal indicating the line to which the messageis addressed causes the reperforator I which is adapted to reperforate messages addressed to that line to reperforate such message in the form of a tape I23. The transmitter controller I23 associated with the line to which the message is to'be transmitted sequentially establishes activating circuits to each transmitter adapted to transmit messages to that line.

At this point it should be noted that the transmitter controller E23 associated with the line 12 controls the uppermost transmitters l2? in Fig. 1 and the transmitter controller 23 associated with the line HI controls the lowermost transmitters 121. Leads I3i from the uppermost transmitter i2! of each multiple reperforator transmitter I22 are connected to a lead :32 extending to the transmitter controller I23 associated with line 4 I62. Similarly, the rest of the transmitters I2'I are connected to the proper transmitter controller I23. The leads I3I and I32 connecting the transmitters I2? with the transmitter controllers I23 are not single leads but are merely schematic representations of all of the leads between the transmitters I2! and the transmitter controllers I23.

The activating circuits for the various transmitters I21 extend over the leads I32 and I3I.

When one of the transmitters i2? is thus activated it transmits its message if it has one ready and if it does not have a message ready to be transmitted the next transmitter H2? in sequence is activated. As has been stated heretofore all messages stored in the multiple'reperforator transmitters I24 include an address signal at the beginning thereof which indicates the station on the line to which the message is being sent. This address signal, when received by all the stations on the line to which the message is being sent, causes mechanism in all the stations to function whichoperates to permit the printer H8 at the stationto which the message is addressed to print the mes;-

sage and prevents all other station receiving printers Hi; from printing the message. Mechanism in the transmitter controller I 23 senses the message and in respons toan end-of-message signal therein activates the next transmitter I27 in sequence.

Basic function mechanism within the receiving printer, which code bars are comparable to code bars 62 to 66 of said Patent No. 2,505,729. Each of said code bars 36 is movable longitudinally to one of two positions in accordance with the marking and spacing impulses of the well known Baudot code. A housing I31 for the function mechanism is also mounted suitably within the printer or other apparatus within which it is contained. A plurality of function bars I 38 are mounted within the housing i3? and are urged to the r ght towards the code bars I by means of springs I39 individual to each function bar I38. Each function bar I38 has a plurality of projections MI which cooperate with notches I42 in each of the code bars.

A continuously rotating power shaft I43 carries an eccentric cam i 44. A collar I46 is mounted rotatably on the eccentric I 44 and has an arm It? to which a lever I48 is secured pivotally at M9. The lever I48 is mounted pivotally on a stationary shaft I5I. A bail I52 has a pair of arms I53 which are mounted pivotally on a stationary shaft i514. A pair of toggle links I56 are secured pivotally at I5! to the arms I53, and are secured at the other ends thereof to a shaft I58 to which the lever I48 is also secured. As the shaft H33 rotates, the lever I43 is oscillated about the shaft I5I to thereby, through the toggle links I58, oscillate the bail I 52. It will be noted that the bail I52 moves back and fizgth twice during each revolution of theshaft A function pawl I 6! has an elongated slot I62 by means of which the function pawl I6I. is

mounted for longitudinal movement on a shaft I63. A spring I65 continuously urges the function pawl I6I to the right (Fig. 3) and counterclockwise about the shaft I63. The function pawl IBI has a latch I64 which cooperates with a shoulder I66 on the function bar I38. Normally the latch I6 rides on the top of the shoulder I66 thereby permitting the spring I65 to retain the function pawl in its right hand position. A function operating lever I68 is mounted pivotally on a shaft I69 and cooperates with a stud I'II on the function pawl I BI. The function operating lever I68 is biased in a clockwise direction by a spring I12 and has a latch I33 which cooperates with a shoulder I 14 on another one of the function bars I38. A latch member I16 is mounted pivotally on a shaft I11 and is urged continuously in a clockwise direction by a spring I 16. The latch member I16 has a. projecting portion I 19 which cooperates with a shoulder I 8| of another of the function operating levers I68.

Assuming that the permutation of positions of the code bars has been set up which corresponds to the function bar [38, the bail I52 moves to the right and all of the projections I4I are opposite notches I42. The spring I39 is thereby permitted to move the function bar I38 to the right, the projections I4I entering the notches I42, and the shoulder I66 underriding the latch !64. Thereafter as the bail I52 moves back to the left during its return stroke it moves the function bar I38 also, the function bar I38 in turn moving the function pawl I 6| to the left. As the function pawl I6I moves to the left in this manner the stud I'II thereon engages and pivots the function operating lever I68 counterclockwise. This permits the unblocking of any other function bars I33 retained in blocked position by the latch I13. The ball I52 remains in its leftward position, thereby retaining the function pawl I6I in its leftward position, and retaining in turn, the function operating lever I68 in its unlatched position until after a bail I62 moves downwardly to trip the latch member I16. After the bail I82 returns to the position thereof shown in Fig. 3, the projecting portion I79 on the latch I16 engages the shoulder I8I of the function operating lever I63 to retain the function operating lever I68 in unblocking position. Thereafter as a new selection is being made in the code bars I36 the bail I62 moves upwardly to strip the function pawls I6I from latching engagement with their corresponding function bars I38.

Fig. 4 is a timing diagram showing the timing of the various parts in the function mechanism shown in Fig. 3. The upper row of curves represents the code bars I36 which are being positioned in accordance with signal impulses during the rise in the first curve, and remain set in this position until they are repositioned as indicated by the rising portion of the second curve. As indicated by the third set of curves, the bail I82 strips the function pawls I6I from. engagement with their corresponding function bars I33 just as the code bars I36 are selected. This stripping of the function pawls I6! just as the code bars I36 are selected means that the last previous selection of one of the function pawls I6I is retained until the last possible moment. The function bars I38, indicated by the second row of curves, move for-ward during the rise of these curves, that is, they move to selected position at this time. The one of the function bars I38, which corresponds to the permutation of positions of the code bars I36, moves to the right until the projections I4I thereon enter the notches I42, as indicated by the peaks in the second row of curves. The bail I52 pushes the function bars I36 to the left as indicated by the fall in the second row of curves. As the function bars I33 and selected function pawls I6I are being moved to the left the bail I82 trips the latches I16 and retains them in tripped condition, as indicated in Fig. 4, until slightly after the pawls I6: and function bars I38 are moved completely to the left. The selected function pawls I6! remain in their leftward position until the bail I52 moves to the right again which is 5 after the next selection of the code bars I36.

Therefore, the stud I1I retains the function .operating lever I68 in unblocking position While the latch I16 is being held tripped and when the latch I16 returns to normal position it retains the function operating lever I63 in unblocking position. If the next subsequent permutation of the code bars I36 corresponds to the function bar I 33 which has been unblocked, such function bar I38 is permitted to become selected so that it can perform its assigned function. If the next subsequent permutation of the code bars I36 does not correspond to the unblocked function bar I38. then as the bail I82 trips the latch I15, such unblocked function bar I38 again becomes blocked.

It is, therefore, readily seen that the selective control mechanism shown generalhr in Fig. 3 enables the selection of a certain function bar I38 only if such function bar is unblocked due to the immediately previous selection of another function bar I 38. This principle is readily extended so that the selection of a first function bar I 38 unblocks asecond function bar; the selection of the unblocked second function bar une blocks a third function bar, etc. This progressive selection can be extended further and is limited only by the number of function bars in the selective control unit. It is also apparent that the progressive selection stops and the entire unit is returned to normal condition as soon as a selection is set up in the code bars I 36 which does not correspond to the unblocked function bar I38. This is due to the tripping of all latches I16 by the bail I82 during each cycle. If, when the latches I16 are tripped, there are no function pawls I6I in selected position, there will be no stud I1I in a position to retain the function operating lever I63 in unblocked position during the tripping of the latches I16.

Station selector function mechanism Reference should now be made to Figs. 5-11 inelusive wherein the mechanism for selecting the outlying station receivers is shown. In this connection it should be noted that certain convenient signals have been assigned, in response to which the function mechanism performs the desired switching functions. The switching signals which have been assigned in the present description have been selected with a View towards eliminating as many errors as possible which would occur, for example, if the same signals happened to be sequentially transmitted within the body of a message being transmitted. In such a case a switching sequence would be initiated and it is desirable to avoid this condition. It is to be understood however. that the particular signals chosen for switching functions have been chosen arbitrarily and it is contemplated thatany other signals could just as readily be used. m

7 this description therefore: Fig-Fig. is the startof-address signal, Letters is the end-of-address signal, and Fig.-Flg.-Y is the end-of-message signal. In the basic system described herein the station addresses are two-letter addresses, the first letter representing the line and the second letter representing the station on the line. The letters indicating the lines include letters from A through J, and those indicating the stations on the lines include the letters K through T. By using this selection of letters there is no problem presented in the case of multiple address messages due to the unblociaing of a function bar on the second letter of one address and the selection of a station on the first letter of an immediately following address. If, however, it is desired to have more than ten stations on one line or more than ten lines in the system it is only necessary to insert a signal, such as a blank, to break up any progression started by the second address letter. The last six letters of the alphabet have been reserved for switching functions according to the present disclosure; however, any other letters can be assigned for the switching functions when so desired.

Referring to Figs. -11, a No. 1 Fig. function bar I86, a No. 2 Fig. function bar I87, a N0. 1 Letters function bar I88, an Address function bar I89, a second Address function bar iiiii, a No. 2 Letters function bar 59!, and a Y function bar I92 are provided in the positions thereof as shown in Fig. 5 in the-outlying station selective control units. It is to be noted that two Address function bars I89 and E98 are shown in Fig. 5 whereas only the Address function bar I 89 is shown in Fig. 8. In order to avoid complicating the drawings and description only the two separately acting Address positions are shown. It is understood, however, that in actual practice the one Address position, as represented by the Address function bar m9, may comprise a pair of progressively acting Address function bars. Similarly, in the second Address position, represented by the Address function bar i913, there may also be a pair of progressively acting Address function bars. This second Address mechanism, represented by the Address function bar I90, is designed to operate in response to a group or broadcast signal to thereby render the telegraph apparatus responsive to a group or broadcast message.

The No. 1 Fig. function bar I86 (as shown in Fig. 6) has the usual cooperating No. 1 Fig. function pawl I92 to which is secured a stud I93. When the No. 1 Fig. function bar E86 is selected in response to the Figures permutation of the code bars G36 the pawl I92 is moved to the left as the bail I52 returns and during such movement the stud I93 pivots a No. 1 Fig. function operating lever till counterclockwise to unblock a bent over portion 202 on the No. 2 Fig. function bar IBI. When the bail I 82 subsequently is raised to the normal position thereof a latch 203 retains the No. 1 Fig. function operating lever 2M in its unblocking position.

If the next permutation of the code bars I36 is a Figures permutation both the No. 1 and No. Z-Fig. function bars I86 and I8! (Figs. 6 and 7) are selected. At this time the selection of the No. 1 Fig. function bar I86 is immaterial, but as the bail I52 returns to the left a No. 2 Fig. function pawl 264 is returned to the left with the No. 2 Fig. function bar. A stud 295 on the No. 2 Fig. function pawl 2M engages and pivots a No.

-mit a printing cycle.

2 Fig. operating lever 20! counterclockwise (Fi 7).

A T-lever 288 (Fig. 5) is suitably mounted for pivotal movement on a bolt 209 and has a pair of arms 2H and H2. The T-lever 2% has a'pin 213 which cooperates with a printer suppressor code bar 2M. When the T-lever 208 is in the solid line position as shown in Fig. 5, the printer, with which the selective control unit is associated, is in printing condition and all of the switching function bars I88, I89, I93, l9l, and I92 are blocked due to the fact that notches H52 in the printer suppressor code bar '2I4 are not aligned with the projections MI on the switching function bars. When the T-1ever208 is in the dotted line position Zlii (Fig. 5) the notches M2 in the printer suppressor code bar 254 are aligned with the projections MI on the switching function bars. Under this condition the switching function bars i83l92 are selected in response to the corresponding permutations of the code bars 535:.

5B shows schematically how the movement of the printer suppressor code bar or switching code bar 2M to switching position (the position occupied by the code bar 2% when the T-lever 2&3 assumes its dotted position Eit) suppresses printing operations in the telegraph printer. A continuously rotating shaft 252 supplies the necessary power for the printing operations through a start-stop clutch 253. Normally the clutch 2555' is held stationary by a clutch lever 25%, but upon the momentary energization of a clutch operating magnet 255, it pulls the clutch lever 25 from engagement with the clutch 253 thereby releasing the clutch 253 for rotation with the power shaft 252. Normally the energizing circuit for the clutch operating magnet 255 extends from positive battery through a contact pair 25d, through the clutch operating magnet 255, to negative battery, so that upon closure of the contact pair 256, which occurs after the code bars have been set for a particular character permutation, the clutch 253 is released. Another contact pair 25? has been included in the clutch operating magnet circuit, the movable member of which contact pair 25? is carried by the printer suppressor code bar 2M. When the printer suppressor code bar 2M occupies its switching position (as shown in Fig. 5B) the contact pair 251 is open and thus the further opening and closing of the contact pair 25:: is ineffective to energize the clutch magnet 255 and thereby per- However, when the code bar 2! occupies its printing position the contact pair 25! is closed and the contact pair 256 functions in its normal manner to start the clutch 253 and enable the performance of printing op; erations. The switching code bar 2ft may also carry blocking wards to suppress printer functions such as line feed and carriage return.

When the bail lei returns to No. 2 Fig. function bar I8! and pawl 294, the No. 2 Fig. operating lever 2M, pivoted therewith, engages the arm 2 on the T-lever 2% to move the printer suppressor code bar 2M into the position where printing is blocked and switching is permitted. This position of the printer suppressor code bar 2 is hereinafter referred to as its switching position as distinguished from its printing position.

When the printer suppressor code bar 2M is thus moved to switching position the selective control mechanism is in condition to respond to address signals.

The Address function bar I89 (Eff. 8) fists a cccfirtin fti'nctifin pawl 21'! which carries thej usiia'l stud 258. Upicn move iii-exit (if the stud eta t the left (Fig. 8') an Adcres fiiricticn cnerting lever gig is pivoted ctdiiniferclockwise aibdut the' ivct shei't [63 Where; by a; latch 22; unbidt ts a bent ov iiiportten 22312 611 the Nb. ,1; Letters ffinctidn bar 188'. The Adbest iii W standing 223 t h" wnicn t a 226 on 2th 1 Address functicn b ar 000;) es. been iinbiocked" diie to the" select n of pnefot tits Address function ba -s me" and its, the No. i Letters tenements! 1 88reintins in unbic sea condition because the Address functiii' gperating' lever 2119* is neid n tnibiocking jc'sitibnb a latch member 225". It" therefqre, ip-parent, wh printer su press r code bar 2M is in stf ii'tfc mg pdsi fidlfjl Withits notches" at align with the nrbjecticnsf fi on the switching function bar's ESQ- 132, thrht'pern iutaticncf ti'iejcodjozirs' MB-ecrrespbndi tqeithero'f the Aclftii'essfnncq tid ban-s ree er mt; en'a bl s nn'biobking' of the N ti Bettf's function br r88. v

A sstim-mg that of the Address tenemenb'tf F8283 OI m5} Has b'eh Selebtd, the next perm'uta Qtth'e odebars' its in thesttiten ing seq en ecf sjig'ntils 2% Letters permutation or en en'd of address sign-a l.- In response tc zi Letters" signal? the N01 1 Letters inncticn' ban iBQ- (Fig-9 A fig beenunblocked, beccnies set: ltd. the reliiffh" stroke of the tan l 5f2' the No. 1 Letters function bar 86 i turn moves" a cooperating N6 1 Letters tenants pawl 226 having astud 22'! thereon. As the stud 22'i is ut "s IBGE'thefN "Z-Eettrsffniicticn heir 19 1 (Fig. It) is selette *invefiabiya As the N 2 Letters function bar lfll is moved to th e'lejt' by the bail F52} 2'1 stiiff 231 or? a} cdi'ies pnding N6 betters function pawl 232" engei'ges' lancli 'ceii nt'rbiockwise"e laitcriing rnenibe 2 33 toy bio'ckmg a tvt 2134i The blocki awr 234 has an amtzse whien codia'erates witn"shoulfl ders on each of the Address functicri bars 189: afte we te tis-ck tnem rrom bein' selected} T1i'e combined-effectof both Letters ftnct'iori bars 188* m istm-etu rn the printer su presso'rflcode 2W4tb printing pdsitidn' only th'e stati dns eb'n'e or the o'ti iei"- of the"Addressifnnctionas and l st hate been select dt-tne- No.- 1" Letters fnfictilifi lea-r I 88 celiising mdvemen't of the printer suppressor: code-hen 2-14" methane. 2 Letters-: funtion bar 1'9! causing blocking of fur= 131181 selection of any Address function bar's? Therefore at' thistimeeach station receiving, printer H6 on the line is either selected for re ceiv-ingthe messageto' follow or b1ocked=from receiving the message'follow ing.

Following the transmission of the end-Of-atd dress signer the text of th'e message 'is tra'nsmifl ted?" Since. only those printerswhose address hais been?titansinittew are in printing coridi t ion; it' s'fl orfl 'y'tiibs' pz intfswhich nrint"the messagei The t t t 10 t .t pd ta 6.. in a ece ver a e a a n ese x t twe t.. ena b be se h Printe u pre s Qdeh 2M in ll one st d st ti ns W Q i sent e t r ntin by these receivers isblogkeci. Upen completion of thefisetofithe mes a e as we? m ss ge f queu s ts snel i Fie-- .i m l -ls y ran m t q- A ne s ar the H- e-fi s' b t nstwit e 2 th st m hint d o re r s itq e n tp tionth prin epp ss de herm t et tt seleeteq statign which has been actually etl it s th imms t y p ec n me sa e h Y f9ll9W i Fis fi n fi ct h release q at l Pr Y Qt-e se e ien b c e n e 1 Address functiqn bars "a ndgestoring the blocking pawl l.t IQ- lLe te si n Qnb n t 11 shows the Y fnncticn mechanism which is rendered eperable in response to a Y signs following the swF se i nel t e e eehe Ywi nst n bar ism t e eft y is e l imiter t ha e n selected, i latches-1 it. ts ti n pe ittfl end; se: mov s; the; pawl to th e left 'lhe Y f nncti lJpavvl l .'3 5 t n e pe ir ot lj lgs A and [953 which engage re Rivet tqu ew qkw tthe bl k p wl 2 ,4

nd the cb ememb i 215 res ct ve y. W en. the ens. s mi-"this piv te n. th manne 5? ns 9 9 1 1 1 pew l to be ni eted;

i kvti u le ur ing n t. s rinewhe eb the prcgecticri 2 ontneblociting pawl 21 9 blocks i f E Q- lLt ts e.ti l s ntba 1 .11 w l he 'l d't fl t e. lLetters function. b 1. .8

eesss for se'i'e'cticn only when one of-the Acidr ess functionbers [89 or [5B is previously elf s end h refore t is ap that after hey. i ne vA t est eams. 1 L tt f nce tip'r'i'b r 18-8 remains blocked from selection until) fittL df f Address? fiinctidn'bars I89 or [90 is received.

Station transmitter Stan f'tifict'ibii mechanism Q 'iiilor tier t c initielte electicn i 1 5 1?? eut inst te qn t fiwhic enm sds es di it i lik wi e s m lar y/news:

all

stati nsl Ajcomplete transmitter start sequence th t causme 1'he""c6rh151etibn of a transmitter start e'cti'ng' arm 236 thereon unbiqcks the A i- 5 signal ccrrespondingto either of the n Figs, 12-14; and following is a in cidertclselect en outlying" steticn trans snppressor. code bar 2 M" It Will be recalled that -F' gftransn itted frqm the central ofificeovera me can s the i nter suppressor codeioars 2 I4 sequence are, Z, Address, and Letters. Accordingly the transmitter start function mechanism includes both No, 1 and No. 2 Fig. function bars I88 and I8! as well as three additional function bars, a Z function bar 24I (shown in Fig. 12), an Address function bar 242 (shown in Fig. 13), and a Letters function bar 243 (shown in Fig. 14).

Referring first to Fig. 12 the Z function bar 24I has a cooperating Z function pawl 244 and a Z function operating lever 246. Selection of the Z function bar 24I causes the Z function operat ing lever 246 to be pivoted in a counterclockwise direction about shaft I69 to thereby unlatch the Address function bar 242. This pivotal movement of the Z function operating lever 246 also causes the closure of a contact pair 241, hereafter referred to as the transmitter start contact. The transmitter start contact 241 will be mentioned hereinafter in the description of the outlying station transmitter control circuits.

The Address function bar 242 (shown in Fig. 13) has a cooperating Address function operating lever 248, which, when actuated by an Address signal following a Z signal, pivots counterclockwise about the shaft I69 and causes the closure of the contact pair 249. The contact pair 249 will be referred to later in the specification as the Address contact 249 in the transmitter control circuit.

" When the transmitter start sequence has been transmitted, if the transmitter whose address 1 signal has been given has a message ready to transmit, such message will be transmitted. However, if such transmitter does not have a message ready to transmit, another Address will be transmitted by the central office, in order to test another outlying transmitter. When the central office determines that the outlying transmitter has a message to transmit, a Letters signal is transmitted over the outgoing side of the line. ters function bar 243 (shown in Fig. 14) is. selected which causes a latch to be pivoted counterclockwise about shaft IT! to unlatch the Z function operating lever 246 and release the printer suppressor code bar 2| 4 at all stations selected for reception at the time the Address sequence of signals was initiated.

It is to be noted that even though the function mechanism comprising the Z function bar 24I (shown in Fig. 12), the Address function bar 242 (shown in Fig. 13), and the Letters function bar 243 (shown in Fig. 14), is located in the selective control unit of each receiving printer together with the function mechanism comprising the Nos. 1 and 2 Fig. function bars I86 and I81 (shown in Figs. 6 and 7), the Address function bar I 89 (shown in Fig. 8), the Nos. 1 and 2 Letters function bars I88 and 19I (shown in Figs. 9 and 10), and the Y function bar I92 (shown in Fig. 11), there is no interference between the operations of these sets of function mechanism. As has already been shown the function mechanism for selecting an outlying station to receive a message includes the function bars I88, I89, I98, I9I, and I92 whereas the function mechanism for actuating an outlying station transmitter includes the function bars MI, 242, and 243. To condition either of these sets of function mechanism for operation a Fig- Fig. sequence is necessary which moves the printer suppressor code bar 2I4 to print suppressin position. If a station receiver is being selected, a Y signal follows the Fig-Fig. sequence inasmuch as a different station receiver is not In response to the Letters signal the Let- 12 selected until the conclusion of a message which ends with a Fig.-Fig.-Y sequence. As has been stated heretofore the Y signal causes all Address function bars I89 and I 9!) to be released for selection and the No. 1 Letters function bar I88 to be blocked. The No. 1 Letters function bar I88 remains blocked until one of the associated Address function bars I89 or I is selected. When a station transmitter is being selected a Z signal follows the Fig-Fig. sequence. The Z.

signal unblocks the Address function bar 242 (Fig. 13) and after the Address signal is received a Letters signal is received. During a station transmitter selection the Nos. 1 and 2 Letters function bars I 88 and I9I (Figs. 9 and 10) as well as the Letters function bar 243 (Fig. 14)

may all respond. Under this condition the No. 1 Letters function bar I88 at a station which was previously receiving a message operates to restore thatstation to receiving condition by moving the printer suppressor code bar 2I4 to printing condition whereas at all other stations the No. 1 Letters function bar I88 remains blocked by the Address function operating lever 2!!! (Fig. 8). The No. 2 Letters function bar I9I (Fig. 10) at all stations responds to the Letters signal but is ineffective inasmuch as the operating lever 234 associated therewith is already blocking the Address function bars I89 and I99. The Letters function bar 243 (Fig. 14) responds to the Letters signal to allow its associated operating pawl 258 to block all Address function bars 242 (Fig. 13).

Station transmitter control selective control unit of the outlying station receiving printers H6 a transmitter start contact 24'! is closed upon the receipt of the transmitter start signal Fig.-Fig.-Z and a transmitter Address contact 249 is closed upon receipt of the Address signal immediately following the transmitter start signal. Both of these contacts 241 and 249 are shown in the schematic representation of the outlying receiving printer H6 in Fig. 15.

In the schematic representation of the outlying station transmitter I22 in Fig. 15 there are shown only those elements deemed essential to a complete understanding of the invention. It will be recalled that the transmitter I22 is like that shown in the U. S. patent to E. A. Gubisch, 2,348,214 which is modified only to the extent necessary to adapt it to the purposes of the present invention. In the transmitter I22, the transmitter distributor is represented by a distributor cam sleeve 32I having a clutch release cam 322 integral therewith. Cooperable with the clutch release cam 322 is a clutch release pawl 323 which is magnetically operated by a clutch release magnet 324. Energization of the maget 324 causes for rotation. The cam 328 cooperates with a con-' tact follower 332 whereby a contact pair 333 is titted thee during each revohititi or th eam 3213. olos'i'ire oi the oohtatt pair are eoiiioietes aciicuit from positive battery, through the closed ooht'aet pair 333, over a lead 334, through the magnet 324th negatitejbattery, to thereby cause therelease of the oath sleeve 321 for rotation.

The transmitter I22 is of the well known piv oted or climbing type havihg a pivoted taiie sensing v mechanism 335. The I t'ap'e sensin mechanism tat is provided with the usual ext-ta tape sensing finger ('notjshown) which controls an end -of tape contact 331. The tape sensing ineohanish 3361s a1so provided with ati'ght tape contact 338. When a tape 'is'position'e in transmitting position in the transmitterboth contacts 331 "and see are closed which completes acircuit from positive battery, through the closed contacts 338 and 331, over a lead 339, through 'a m gnet 3'41, to negative Battery. when the endfdf the I tape is reached the contact 33'?! opens and when the tape becomestoo tight between the perforator (inotr shown') and the tape sensing mechanism 3i3fithe contact "338 is opene ineitherof which cases the circuit to the magnet 34'! is broken.

The transmitter 122 'is also provided "with a selective control unit which is represented by only a Y function mechanism 342. The pur ose of this selecti e control iihit is to 'monitot the me sages transmitted and t recognize an end-ofme age signal l 'ig-Fig-Y in theriiees'aees eihe smitted Upon lrecognizing this end ofi ioe' age signal the Y ru'nction mechanism 342 dpens "a circuit to the tape reader release magnet 3749 to thereby render the transmitter I22 inopa ve .l

When the attendant at the outlying station l22'prepares a message for transmission, he perrotates this messagein a tape. In order to render the transmitter operable to transmit this tape message, the operator firstplaces the tape in the tape sensin mechanism, which automatically closes the contact 331. Assuming that the'length of tape between thetape perforator IZI andthe tafie siensing'mec'ha'nism 335 is sufiicient to prevent the opening or the contact 338, there is established at this time the aforementioned circuit from positive battery, through the closed tight tape coiitact '338, through'the closedta'pe out contact 337, over lead 339, through the tape out magnet 34!, to negative battery.

l j'nergization ofthe tape out magnet 34! causes thism'agnet to pullup all of its armatu'r s 343, 3144 and sit tothere'by closec'ontacts 341 and 34 8,and opena contact 349. Closure of the contact 341 prepares a circuit to aready'magnet 351.

When theoperato'r, having placed the message tapei'n the tape sensing mechanism 336, close's mahually a normally open ready 's'wit'ch 352, a circuit is established from positive battery, through an arinature 353 and its normally closed contact 354, over apai r of leads 356'and 3 51, through the now closed contact 341 and armature 343-, over a lead 358, through the closed ready switch 3'52, over a lead 359, over a lead 3lil, through the ready magnet 35], to negative bat tery. Energization of the ready -magnet 35i causes itto pull up all of its armatures 382, 363 and 334 which breaks the corinectionibetween the armature352 anda contact 366, and makes connectionsbetwenthe armature 362 anda contact 3'65,'betweenthe armature'363'and a' contact 367 and between the armature 364 and a contact 363. Clo slirebf the armature 363 with" the contact 361 completes a locking circuit for the ready magnet 35tover ac'ircuit from positiveha'ttery, through ah arhia'td'r'e 353 ahd its 'hdrmally eiosed contact 354, over a pair of leads 356 and 351, through the now closed contact 347 and armature 34-3, over a lead 358, over a lead 369, through a nor mally closed not-ready switch 3', over a lead ,1 2, through the armature 363 and contact 361. over the lead 36!, through the ready magnet 35!, to negative battery. Closure of the arrha ture 364 with the Contact 368 completes :a circuit from positive battery, through the closed arma-= ture as; and contact see, over a lead 310, through a ready lamp 313, to he'gative battery. The outlying station transmitter is therefore, in confirtion to respond to a call signal transmitted theretofrom the central oflice. If, for some reason, the operator decides not to transmit the message in the transmitter, he depresses the not-ready switch, thereby breaking the locking circuit toth'e ready magnet, and the message cannot be transfnitted due to the opening of armature 362 from the contact 335. 4

A Assuming that either there is notape .positioned for transmission in the tape sensing mechanism 336 or the operator, having positioned a tape in the tape Sensing mechanism 336, has not yet depressed the ready switch 352 or has depressed the not-ready switch 3', the operation of the transmitter "is as follows. At "this time the armature 362 andthe contact 388 are closed. The central ofiice, in calling the transmitter T22, transmits Fig-Fig-Z-Addres's. The 'cofitaet 2'41 closes temporarily on the Z signal, as has been heretofore described, but this is immaterial for at this time the only circuit in which contact "217 is located is open at an'armatii're 374 and contact 375. On the address sighai in this sequence of signals the contact 249 closes and a circuit is established from positive battery, through the closed contact 249, over a 'lead 311, through the closed armature 3 62 and contact 366, over a lead 378, through the distributor clutch release magnet 324, to neg'ative battery. Energization of the magnet 324 causes the pawl 32's to be pulled up thereby releasing the distributor cam sleeve 32] for rotation. At this time, due to the fact that no tapeis being sensed the distributor cam sleeve 32'! will cause a blank signal to be transmitted back to the central :ofiice. Such blank signal causes the central office to transmit the next Address signal in the sequence of stations on the line. Uponreceipt of this next Address signal, at th'e receiving printer H5, ahai -lsz (Fig. 3) in the receiving printer H6 is caused to strip the Address function pawl at that station from the Address function bar to thereby open the contact 249. Opening of the contact 249 causes the distributor cam sleeve clutch release magnet 324 to be de-energized which stops the rotation of the distributor cam sleeve '32] in the station trans mitter I22.

Assuming that the attendant has positioned a message tape in the tape sensing mechanism 335, and has depressed the ready switch 352,'the dper'ationof the transmitter H22 isa's follows. It should he recalled that under these conditions theready magnet 35l isener'gized and locked'up its energized condition whereby the armature 362 and contact 365 areclosed. Asin the case where the ready magnet-3M is ole-energized, the armature 374 is not closed with the contact 316 when the contacted? closes in response to the Z signal of the=Fig. Fig.Z Addresscalling signal sequence, so that nothing happenson receipt of the Zsi'gnal. Upon'rec'eipt-oi the Address signal of'the transmitter calling sequence, the contact 249 closes to thereby energize the tape reader clutch magnet 329 and a send magnet 313. The energizing circuit for the send magnet 313 extends from positive battery, through closed contact 249, over the lead 311, through closed arma ture 362 and contact 335, over a lead 33!, through the send magnet 319, to negative battery. The energizing circuit for the tape reader clutch magnet 329 extends from positive battery,

through closed contact 249, over the lead 311,

through closed armature 332 and contact 335, over the lead 33!, over a lead 332, through the magnet 329, over a lead 383, through the presently closed armature 346 and contact 348, to negative battery.

Energization of the magnet 323 causes the pawl 33! to be pulled up to thereby release the tape reader cam sleeve 326 for rotation. Rotation of the tape reader cam sleeve 323 causes the high part of the cam 328 to close the contact pair 333 which results in the energization of the distributor clutch release magnet 323 over a circuit from positive battery, through the closed contact pair 333, over the lead 334, through the magnet 324, to negative battery. Energization of the magnet 324 causes the pawl to be pulled up to thereby release the distributor cam sleeve 32! for rotation whereby signals being sensed in the tape in the tape sensing mechanism 333 are transmitted.

Energization of the send magnet 319 causes all of its armatures 314, 334, and 333 to be pulled up to cause these armatures to make with their respective cooperating contacts 3"!3, 33'! and 333. Closure of the armature 336 with the contact 333 completes a circuit from positive battery, through presently closed armature 353 and contact 334, over the lead 356, over a lead 339, through a presently closed contact pair 33i associated with the Y function mechanism 342 of the transmitter selective control unit, over a lead 332, through the presently closed contact 388 and armature 336, over the lead 332, over the lead 38!, through the send magnet 319, to negative battery. This circuit serves as a locking circuit for the send magnet 319 to thereby retain the armature 336 and contact 388 in closed relation.

Retention of the armatures 333 and contact 388 in closed relation also completes a circuit over the path described immediately above to the lead 382, and thence over lead 332, through the tape reader clutch release magnet 323, over the lead 383, through the closed armature 333 and contact 343, to negative battery. It is, therefore, apparentso long as the tight tape contact 333 and the end of tape contact 33'! remain closed, that the tape reader clutch release magnet 329 retains the pawl 33! disengaged from the cam 321 and transmission of the message continues. At the end of the message a Fig.-Fig.-Y sequence of signals is monitored by the selective control unit represented by the Y function mechanism 342 in the transmitter, and the contact pair 39! is opened which immediately breaks the circuit to send magnet 319 and clutch magnet 333. At this time therefore, transmission of signals ceases due to the de-energization of the magnet 339 and resulting sustained de-energization of the distributor clutch release magnet If during transmission of a message, the tape sensing mechanism 333 runs out of tape so that the tape out contact 33! opens or the tape becomes too tight, that is if transmission from the tape takes place faster than perforation of additional tape, so that the tight tape contact 333 16 opens, the tape out magnet 34! is tie-energized; De-energization of the magnet 34! permits the armature 343, 344 and 343 to'fall back thereby causing the closure of the armature 344 with the contact 349 and the opening of the armatures 346 and 343 with their respective contacts 348 and 341.. At this time the magnet 329 becomes de-energized so that transmission ceases; however, the send magnet 319 remains energized so that if the tape is repaired promptly transmission is resumed. Closure of the armature 344 with the contact 349 completes a circuit to a tape out indicator lamp 393 from positive bat-.

tery, through the presently closed armature 353 and contact 354, over the leads 356 and 351, through the closed contact 349 and armature 344, over a lead 394, through the presently closed contact 38'! and armature 384, over a lead 396,

through the tape out indicator lamp 393, to negative battery.

When the transmitter 522 ceases transmitting without having transmitted an end-of-message signal, Fig-Fig-Y, an automatic timer mechanism is initiated at the central office, which, after a predetermined interval initiates a switching operation. As the signals of all outlying transmitter switching sequences are Fig.-Fig.-Z- Address, the contact 24! closes on the Z signal of all of these sequences. Due to the fact that the send magnet is energized at this time, a circuit is completed from positive battery through the presently closed contact 241, over a lead 331, through the presently closed armature 314 and contact 333, over leads 333 and 399, through a break magnet 433, to negative battery. Energization of the break magnet 43! causes its armatures 353, 492 and 433 to be pulled up to thereby break the circuit over the armature 353 and contact 354, and to close the armatures 402 and 403 with their respective contacts 404 and 406. The closure of the armature 492 with the contact 494 completes a locking circuit for the break magnet 43! from positive battery, through a normally closed restart key 431, over a lead 438, through the closed contact 494 and armature 492, over the leads 338 and 399, through the break magnet 40!, to negative battery. The closure of the armature 403 with the contact 433 completes a circuit from positive battery, through the closed contact, 433

and armature 433, over a lead cm, through a break indicator lamp 439, to negative battery. The attendant is thereby notified, due to the illumination of the break indicator lamp 433 and the tape out indicator lamp 333, that transmission from his station has ceased, that the cause of cessation of transmission is due either to no net 35! so that the message will be transmitted when the station is subsequently called.

It should be noted that depression of the not ready key 31! While a message is being transmitted does not interrupt transmission of a current message due to the fact that the send magnet 313 remains energized over its locking circuit independently of the condition of the ready magnet 35!.

It is to be understood that the above-described 17 arrangement is merely illustrative of the application of the principles of the invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the-invention andfal-l with in" the spirit and scope thereof.v

What is claimed is 1;. In a telegraph printer, selector mechanism comprising a plurality of permutation b ars arrangedin superposed horizontal planes, rune-- tion controlling unit comprising in a unitary structure a plurality of function bars slidably mounted therein for movement toward and away from said permutation bars, the leading edge of each function bar adapted to cooperate selectively with said permutation bars, a bail member constantly contacting said leading edges to hold said function bars away from said permutation bars against the action of individual springs which normally tend to urge respective function bars toward said permutation bars, a secondary member operably associated with each function bar and disposed thereabove, spring means individually associated with said secondary member to urge said secondary members in a direction toward said permutation bars, each secondary member provided with an engaging portion adapted to be interengageable with an engaging portion on its associated function bar, means for operating said ball member periodically to enable movement of said function bars toward said permutation bars by said individual springs, where by one of said function bars is selected according to a permuted setting of said permutation bars to effect cooperative interengagement between the engaging portions of said selected function bar and its respective secondary member, whence upon the return movement of the selected function bar by said ball, said secondary member is actuated directly and positively, a lateral projection on said secondary member, means controlled by said lateral projection to directly control a function, and periodically operated stripper means effective to disengage said secondary member from said selected function bar.

2. In a telegraph printer, selector mechanism comprising a series of permutation code bars arranged in superposed horizontal planes, a function controlling unit comprising in a unitary structure a plurality of selectable bars slidably mounted therein for movement toward and away from said permutation code bars, each selectable bar having coded projections on its leading edge confronting the coded edges of said permutation code bars, a bail member constantly contacting said leading edges to hold said selectable bars away from said permutation code bars against the action of individual springs which normally tend. to bias respective selectable bars toward said permutation code bars, a pawl member operably associated with each selectable bar and disposed thereabove in a common vertical plane, spring means individually associated with said pawl members to bias said pawl members in a direction toward said permutation code bars, each pawl member provided with an integral projection adapted to be interengageable with an integral projection on its associated selectable bar, means for oscillating said bail member periodically to enable movement of said selectable bars toward said permutation code bars by said individual springs, whereby one of said selectable bars is selected according to a permuted setting of said code bars to eflect cooperative interengagement between the integral projections of said selected selectable bar and its respective pawl member whence upon the return movement of the selected selectable bar by said ball, saidpawl member isactuated directly and positively, a stud on saidpawl-member, means controlled by said studadapted-- to directly control a function, and pe'riodically re ciprocating strippenmeans adapted to disengage said.- pawl member from said selected selectable bar.

3. In a telegraph printer, selector mechanism comprising a plurality of permutation bars arranged in superposed horizontal planes, a function controlling unit comprising in a unitary structure a plurality of function bars slidably mounted therein for movement toward and away from said permutation bars, the leading edge of each function bar adapted to cooperate selectively with said permutation bars, a bail member constantly contacting said leading edges to hold said function bars away from said permutation bars against the action of individual springs which normally tend to urge respective function bars toward said permutation bars, a secondary member operably associated with each function bar and disposed thereabove, spring means individually associated with said secondary mem-- bers to urge said secondary members in a direction toward said permutation bars, each secondary member provided with an engaging portion adapted to be interengageable with an engaging portion on its associated function bar, means for operating said ball member periodically to enable movement of said function bars toward said permutation bars by said individual springs, whereby one of said function bars is selected according to a permuted setting of said permutation bars to effect cooperative interengagement between the engaging portions of said selected function bar and its respective secondary member, whence upon the return movement of the selected function bar by said bail, said secondary member is actuated directly and positively, a lateral projection on said secondary member, and means controlled by said lateral projection to directly prepare an adjacent function bar for selection.

4. In a telegraph recording apparatus, a plurality of code bars, one of said code bars having a switching control position and a printing control position and the remainder being signal responsive, all of said code bars being movable to form a plurality of permutations thereof, printing means responsive to said permutations of said code bars upon movement of said one of said code bars to printing control position, a first switching means for effecting movement of said one of said code bars to switching control position in response to a switching permutation of said signal responsive code bars, and a second switching means for effecting movement of said one of said code bars to said printing control position in response to a printing permutation of said signal responsive code bars.

5. In a telegraph system, a line, a transmitting station for transmitting signals over said line, a plurality of telegraph recorders on said line for receiving said signals transmitted by said transmitting station, a plurality of code bars in each of said recorders, one of said code bars in each of said recorders having a switching control position and a printing control position and the remainder of said code bars in each of said recorders being permutably positionable in response to said signals, printing means in each of said recorders responsive to said permutations of the code bars therein upon movement of said one of said code bars therein to printing position, a first References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Lang Sept. 28, 1935 Lang May 4, 1943 Lang June 12, 1945 McDavitt et a1 Apr. 11, 1950 McGoflin Aug. 7, 1951 Zenner Sept. 18, 1951 

